随钻地层压力监测在渤海A油田开发生产中的应用

LWD formation pressure monitoring in development and production of A oilfield,Bohai

渤海A油田生产层位为馆陶组,油藏类型为岩性-构造油气藏,于2003年1月投产。由于边底水不发育,2003年8月开始注水开发。为了获得该油田目前的地层压力数据,在后期实施的调整井随钻过程中使用了哈里伯顿公司的随钻地层压力测试器GeoTap,在钻开储集层的同时进行地层压力测量。GeoTap测试器测量位置靠近钻头,且测量时钻井液滤液尚未侵入地层,因此可以获取精确的地层压力值。运用这些地层压力数据实现了现场快速准确判断主力油层压力的变化及其连通性,同时分析断层开启和层间注采不均衡情况,不但可在钻井期间根据主力油层压力变化情况及时改变井别,调整和完善注采井网,缩短决策时间,而且其丰富的随钻地层压力资料也为优化注水提供了可靠依据。

The production horizons in A oilfield,Bohai is Ng formation,its reservoir type is lithologic structural reservoirs,and was put into production in January 2003.Since the edge and bottom water is not developed,water flood development was begun in August 2003.In order to obtain the current field formation pressure data,Halliburton LWD formation pressure tester GeoTap was used in the late implementation of adjustment well drilling,formation pressure measurements were carried out as soon as the reservoir was drilled through.GeoTap tester measurement position is close to the bit and the filtrate has not yet invaded to the formation during measurement,and therefore an accurate formation pressure can be obtained.The use of these formation pressure data can achieve quick and accurate determination for the major reservoir pressure change and its connectivity at the site.Simultaneously,faults open and interlayer injection imbalance can be analyzed,it not only shortens the decision-making time for promptly changing well type,modifying and perfecting flood patterns according to the changes in the major reservoir pressure during drilling,but a wealth of formation pressure data also provide a reliable basis for optimizing water injection.